The following information is based on original research by R.E. Tulloss.
The pale tan cap is 22-43 mm wide and has an orange-brown center. The white edge is striate and the ridges between striations are bumpy. The cap's flesh is 1-4 mm thick. The cap thins evenly for about half of its radius and then is membranous to the edge. Volval remnants are present on the cap as a dense layer of fine powder and some larger crumb-like warts that often extend to the margin and are easily separated from the cap.
The gills are free and distant from the stem and somewhat close together. There is a fine descending line on the upper stem. The gills are 1.5 - 5 mm broad and have a finely tufted margin. The short gills are squarely cut off, unevenly distributed, and of diverse lengths.
The cream white to pale yellow stem is 42 - 80 x 4 - 6 mm, narrows upward, and flares at the top. The stem is vertically lined and unchanging when cut or bruised. The bulb is spherical to slightly club-shaped and is 9 - 12 x 8 - 11.5 mm. The hollow stem's flesh is off-white to yellowish-white, and infrequently stains faint brown. The stem's central cylinder is 1 - 3 mm wide and lined with cottony white fibers. The volval remnants are present as white tufts or warts (similar to those on the cap) around the stem's base at the top of the bulb.
The odor of this taxon is indistinct; and its taste was not recorded.
This species was found growing in small groups under Oak trees (Quercus) in the dense tropical understory of a cloud forest in crumbly black loam and litter.
In general this ringless species is reminiscent of taxa such
as A. farinosa. —R. E. Tulloss and N. Goldman
Tulloss et al. nom. prov.
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The following material is based on original research by R. E. Tulloss.
22 - 43 mm wide, pale tan (10YR 7/6) with orange-brown disc and whitish over marginal striations, unchanging when cut or bruised, tacky, subshiny; context 1 - 4 mm thick, thinning evenly for 50-60% of radius and then membranous to margin; margin tuberculate striate (0.45-0.6R), nonappendiculate; universal veil as dense layer of fine pulverulence and some larger crumb-like warts, unchanging when bruised, often extending to margin, detersile.
free to receding without decurrent line on stipe, close to subdistant, cream to water-soaked cream in mass, pale yellowish white to pale brownish white in side view, 1.5 - 5 mm broad, with white flocculose margin; lamellulae truncate to subtruncate, unevenly distributed, of diverse lengths, scattered.
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42 - 80 × 4 - 6 mm, white to cream to pale yellowish white (2A2), unchanging when cut or bruised, narrowing upward, flaring at apex, finely longitudinally striatulate; bulb globose to subglobose to subclavate, 9 - 12 × 8 - 11.5 mm; context off-white to yellowish white, infrequently with faint brownish stain in bulb, hollow, with central cylinder 1 - 3 mm wide lined with cottony white fibrillose material, with concolorous larva tunnels; exannulate; universal veil as white flocculence around base of stipe at top of bulb with some attached warts similar to those on pileus.
Odor indistinct. Taste not recorded.
Spot test for laccase (syringaldazine) - negative throughout basidiocarp except for small spot on very base of bulb. Spot test for tyrosinase (paracresol) - positive throughout stipe, in lower half of pileus context, in upper half of lamellae, along bottom surface of bulb. Test voucher: Tulloss 7-19-96-A.
Subgregarious. At 1620 m alt. Under Quercus in dense tropical understory of cloud forest in friable black loam and litter.
MEXICO: HIDALGO—Mpio. Tlanchinol - at reputed type locality of A. herrerae [20°58’57” N/ 98°40’05” W, 1620 m], 19.vii.1996 Dr. Arturo Estrada Torres & Adriana Montoya Esquivel s.n. [Tulloss 7-19-96-B] (RET 251-8; TLXM), Dr. Arturo Estrada Torres, R. E. Tulloss, Dra. Lucia Varela Fregoso, & Adriana Montoya Esquivel s.n. [Tulloss 7-19-96-A] (RET 251-9; TLXM).
In general terms, this exannulate species is reminiscent of taxa such as A. farinosa.
—R. E. Tulloss
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